mirror of
https://github.com/xcat2/confluent.git
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136 lines
4.6 KiB
Python
136 lines
4.6 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2016-2018 Lenovo
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# This handles ownership of asynchronous behavior driving sessions
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# with websockets. There was a long-polling HTTP mechanism but that is removed
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# Now it's possible to have asynchronous requests multiplexed over a single websockets
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# with none of the "choppiness" inherent to multiple long-polling requests
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# Additionally support console session multiplexing, to mitigate needed
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# connection count.
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# Also, this should allow a client to register for notifications of things
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# like node add/delete or an event firing, ultimately.
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# Much like console sessions, these will be reaped if a client spends too
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# far away.
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import asyncio
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import collections
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import confluent.exceptions as exc
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import confluent.messages as messages
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import confluent.util as util
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import confluent.core as core
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import confluent.log as log
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import time
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_asyncsessions = {}
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_consolesessions = None
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def _assign_asyncid(asyncsession):
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sessid = util.randomstring(32)
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while sessid in _asyncsessions:
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sessid = util.randomstring(32)
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_asyncsessions[sessid] = {'asyncsession': asyncsession}
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return sessid
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class AsyncTermRelation(object):
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# Need to keep an association of term object to async
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# This allows the async handler to know the context of
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# outgoing data to provide to calling code
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def __init__(self, termid, asynchdl):
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self.asynchdl = asynchdl
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self.termid = termid
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def got_data(self, data):
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self.asynchdl.add(self.termid, data)
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class AsyncSession(object):
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def __init__(self, wshandler):
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self.asyncid = _assign_asyncid(self)
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self.wshandler = wshandler
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self.termrelations = []
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self.consoles = set([])
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async def add(self, requestid, rsp):
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await self.wshandler(messages.AsyncMessage((requestid, rsp)))
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def set_term_relation(self, env):
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# need a term relation to keep track of what data belongs
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# to what object (since the callback does not provide context
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# for data, and here ultimately the client is responsible
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# for sorting out which is which.
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termrel = AsyncTermRelation(env['HTTP_CONFLUENTREQUESTID'], self)
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self.termrelations.append(termrel)
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return termrel
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def add_console_session(self, sessionid):
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self.consoles.add(sessionid)
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def destroy(self):
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for console in self.consoles:
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_consolesessions[console]['session'].destroy()
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self.consoles = set([])
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del _asyncsessions[self.asyncid]
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async def run_handler(self, handler, requestid):
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try:
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async for rsp in core.iterate_responses(handler):
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await self.add(requestid, rsp)
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await self.add(requestid, messages.AsyncCompletion())
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except Exception as e:
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print(repr(e))
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log.logtrace()
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await self.add(requestid, e)
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async def run_handler(hdlr, req):
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asyncsessid = req.headers['ConfluentAsyncId']
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try:
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asyncsession = _asyncsessions[asyncsessid]['asyncsession']
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requestid = req.headers['ConfluentRequestId']
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except KeyError:
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raise exc.InvalidArgumentException(
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'Invalid Session ID or missing request id')
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cloop = asyncio.get_event_loop()
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cloop.create_task(asyncsession.run_handler(hdlr, requestid))
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return requestid
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def get_async(env, querydict):
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return _asyncsessions[env['HTTP_CONFLUENTASYNCID']]['asyncsession']
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def handle_async(env, querydict, threadset, wshandler=None):
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# This may be one of two things, a request for a new async stream
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# or a request for next data from async stream
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# httpapi otherwise handles requests an injecting them to queue
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if 'asyncid' not in querydict or not querydict['asyncid']:
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# This is a new request, create a new multiplexer
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currsess = AsyncSession(wshandler)
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if wshandler:
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yield currsess
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return
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raise Exception("Long polling asynchttp is discontinued")
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def set_console_sessions(consolesessions):
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global _consolesessions
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_consolesessions = consolesessions
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